Overview: Joe goes undercover inside State Prison to bring down a ruthless Mexican gang leader who put out a hit (from behind bars) on a SFPD undercover cop who had infiltrated the Mexican Mafia. Nash runs the investigation on the outside, hoping to fulfill a promise to the dead man's widow by catching the trigger man. Naturally he'll have to overcome the distraction caused by Nick, putting together his will, who discovers some long-forgotten wealth.